Fixed: Drag-and-Drop Behavior

🛠️ What Was the Issue?
Drag-and-drop actions in form and quiz builders sometimes replaced items instead of inserting them, leading to unexpected order changes.
✅ What’s Fixed
Drag-and-drop now inserts items exactly where dropped. The behavior is consistent, reliable, and works as expected across all positions.
🔍 Key Fixes & Improvements
Correct Placement:
 Items insert before the target, not swap.
Adjacent Moves:
 Smooth handling for nearby position changes.
Consistent Logic:
 Same behavior in both form and quiz builders.
Predictable Results:
 No surprises, elements go where you drop them.